"Back to the Future" writer and producer Bob Gale curses at fans when constantly asked about "Back to the Future 4."

Bob Gale co-wrote all three Back to the Future movies with director Robert Zemeckis; suffice to say, a fourth film is not in the works.

Gale and Zemeckis also co-wrote the short film "Doc Brown Saves the World," which appeared on the 30th anniversary BttF box set in 2015. The same year, Gale co-authored a Back to the Future comic book series for IDW.